Burglar alarm and limited movement lock for doors



June 29 1926.

C. W. COLE BURGLAR ALARM AND LIMITED MOVEMENT LOOK FOR DOORS Filed Jan. 28 1926 Am fig g y //]W W /i g M K /3 CYMCOIZIVZCTOR. 5; 5 m

ATTORNEY.

Patented June 29, 1926.

CLEVELAND wA' 'rEn'coLE, or DENVER, cononfi'no.

BURG-LAR ALARM AND LIMITED MOVEMENT Lockror. nouns.

Application fi1ed..-January 28, 1926. Sei'iaI 110.84,!301.

This invention relates to devices, for attachment to doors, which give an audible indication that the door is being opened.

The principal object of the invention is to provide a deviceof this character which will not only give an audible indication that an attempt is being made to open the door, but will prevent the door from being opened.

A further object is to provide means in a device of this character which will, if desired, allow the door to be opened to a limited predetermined degree.

Other objects and advantages reside in the detail construction of the invention, which is 5 designed for simplicity, economy, and eflicieney. These will become more apparent from the following description.

In the following detailed description of the invention, reference is had to the accompanying drawing which forms a part hereof. Like numerals refer to like parts in all views of the drawing and throughout the description.

In the drawing: Fig. l is an elevation of the invention attached to a door and the casing thereof.

Fig. 2 is a plan view of the same. Fig. 3 is an end elevation of the alarm device.

Fig. 4 is a detail view of the chain attach ment link.

The invention comprises a frame 10, semicircular in shape, and having a flat base portion 11. A spring actuated alarm bell 12,

controlled by a trigger 13, is carried on the base 11, within the frame 10. The frame 10 is designed to be secured to a door, ind.i-

cated at 1 1, by means of suitable screws 15. Extending across the semi-circular portion of the frame 10, is a long slot 16 communicating at one extremity, by a cross passage 17, with a relatively short slot 18. The trigger 13 of the bell 12 is arranged directly under and adjacent the extremity of the short slot 18.

Secured to the door casing, indicated at 19, by means of screws 20, is a plate 21, to which a chain 22 is secured. The chain 22 terminates in a key 23, illustrated in detail in Fig. 1. This key is secured to the end link of the chain 22, and has its extremities oppositely extended, forming feet 24. The chain 22 is only of a length sufficient to allow the key 23 to be inserted in the cross passage 17 of the frame 1 wh n h door s closed. The'keylthenmayvbe brought into alignment with :either the long slot 16 or the short slot 18, with its feet-24-engaging the under sides of the slotqedges.

Let us-assume that-the key'231is in alignment with the short slot 18. Any move ment of the door will now cause the key to move into the slot 18, where it will contact with the trigger 13 of the bell 12, thus causing the trigger to release the bell mechanism so as to give an audible alarmthat an attempt is being made to open the door. The key will then contact with the end of the short slot 18 and prevent the door from being opened; The short slot 18 is of a length which will allow the door to be moved approximately an eighth of an inch, so as to prevent an intruder from seeing past the door.

Should the occupant of the house or room, in which the device is installed, desire to interview the intruder without allowing him to enter, the key 23 is passed, through the cross passage 17 into alignment with the long slot 16. The door may now be partially opened which will cause the key to travel acoss the semi-circular frame 10 the length of the long slot 16. The slot 16, however, when the key has reached its extremity. will prevent further opening of the door. The length of this slot is such as to allow the door to open approximately six inches, through which opening, the intruder may be interviewed but his entrance is absolutely barred since it is impossible to remove the key without closing the door. V'Vhen not in use, the key is removed from the frame 10 and allowed to hang upon its chain at the door casing.

The bell 12 may be any of the usual spring actuated bells such as employed for press button door bells and the like. The mechanism for ringing the bell forms no part of the present invention and, since any trigger actuated mechanism would serve the purpose, further description thereof is deemed unnecessary.

WVhile a specific form of the improvement has been described and illustrated herein, it is desired to be understood that the same may be varied, within the scope of the appended claims, without departing from the spirit of the invention.

avin h s assented the in i ha having a relatively long slot and a relatively,

short slot formed therein; said'slots communicating witheach other; a tr gger arranged adjacent said short slot so as to release an alarm mechanism; a flexible c0- acting member; a key carried by said flexible member and arranged to detachably engage either of said slots and travel therein.

2. A device adapted to give an audible signal upon opening a door and to limit said opening, comprising a semi-circular frame V p r 1,590,182

having slots formed therein a base arranged to be attached to said door; and support said frame a bell carried within said frame; a trigger operatively connected to said bell; means arranged to be secured to the casing of said door and to detachably engage said frame so as to actuate said trigger at predetermined positions of said door, said means comprising a plate secured to said casing; a chain secured to said plate; and a key carried on the extremity of said chain andarranged to travel in said slots in said frame.

In testimony whereof, I affix my signature.

CLEVELAND WALTER COLE. 

